Mounting of diamond dressing tools



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2,764,144 p MOUNTING OF DIAMOND DRESSING TOOLS Harold Stuart Hallewell,Hillingdon Heath, England Application December 28, 1951, Serial No.263,770

Claims priority, application Great Britain January 3, 1951 4 Claims.(Cl. 12S- 11) The present invention relates to improvement-s inmountings for diamond or other dressing tools for use in profilingequipments, for example grinding wheel dressing equipments, for exampleof the kind which are adapted to translate a form from a template to thegrinding wheel or other member to be dressed, and has for its object toprovide a mounting which will enable the operator of the equipment tochange over quickly and easily from one diamond or other tool, e. g. aroughing or worn finishing diamond no longer suitable for finish trueingto another tool, e. g. a new or slightly worn finishing diamond such asis normally necessary for accurate reproduction.

With this object in view, the present invention provides for detachablymounting two or more dressing tools in tandem in the tool-supportingmember of the equipment which is normally a spindle capable of beingrocked about its axis and is adapted to traverse across the surface ofthe member to be dressed or profiled (see for example patentspecification No. 2,469,844) the arrangement being such as to permitsaid tools to be adjusted laterally relative to said axis.

An improved mounting according to the present invention comprises aspindle provided with a bracket, which is mounted to traverse across theprofile of a grinding wheel or other member to be dressed or profiledand is formed with a recess for the reception of at least two toolcarrier blocks in tandem, means for adjusting said carrier blockslaterally with respect to said axis, and individual clamping means forsaid blocks adapted when tightened to clamp the blocks against locatingsurfaces formed by surfaces of said recess.

In order that the invention may be clearly understood and readilycarried into effect it will now be described in more detail withreference to the accompanying drawings, in which:

Fig. 1 is a side view of a mounting according to the invention forgrinding wheel dressing equipment,

Fig. 2 is a plan view of part of the mounting of Fig. l, looking in thedirection of the arrow X, with the carrier blocks of Fig. 1 removed, and

Fig. 3 is a view of part of the mounting showing a modiication thereof.

The mounting includes a curved arm 1 of channel section formedintegrally on a spindle 2 which is mounted in bearings 3, carried by amember 4, for angular movement about an axis Y-Y. Member 4 may forexample be a linkage of a pantograph mechanism as described in patentspecification No. 2,469,844. The arm 1 is formed at its outer end with arecessed bracket portion 1 bounded by bottom surfaces 5, 6 and 7 andside surfaces 8, 9 and 10. Said recessed bracket portion serves as awell to receive three diamond tool carrier blocks 12, 13 and 14, intowhich are secured respectively diamond tools 15, 16 and 17 by means oflocking screws 18. Each block is provided with its own holding-downmeans and its own alignment adjustment means. The holding-down means ofblock 12 includes a tension bolt 19 which projects States Patent O j2,764,144 Patented Sept. 25, 1956 lCC through a bore formed in the outercorner of the bracket 1 at about 45 to the surfaces 5 and 8, the bolt 19engaging a screw-threaded bore in the block 12 and being provided with amilled knob 20 `which enables the bolt 19 to be tightened so a-s to drawthe block 12 down against the surfaces 5 and 8. The alignment adjustmentmeans for block 12 comprises a knurled ring 21 fixedly mounted on ascrew-threaded spindle 22 which is mounted in screwthreaded bores in twolugs 23 on the arm 1. The ring 21 engages a groove 24 formed in the sideof the block 12, and the spindle 22 carries a knurled adjusting knob 24,angular movement of which causes the ring 21 to move laterally withrespect to the axis Y-Y of the spindle 2, and by entraining the block 12to move the latter in one direction or the other to align it suitably.It will be understood that the required alignment adjustment will alwaysbe very small and is permitted by the gap between the ring 21 and thespace between lugs 23, the bolt 19 being eased when it is desired toadjust the alignment of the block.

The holding down means for block 13 comprises a tension bolt 25 providedwith a knob 26. It co-operates with a screw-threaded bore in block 13 sothat when tightened it draws the block down on to the surfaces 6 and 9.The alignment adjusting means for block 13 comprises a knurled ring 27which is tixedly mounted on a screw-threaded spindle 28 which projectsinto screwthreaded bores in the sides of the channel-section arm 1 andis provided with a knob 29. The ring 27 projects through slots in thecorner of the walls of the bracket having the surfaces 6 and 11, andinto a groove in the sideof the block 13.

The holding down means for block 14 comprises a tension bolt 30 providedwith a knob 31, and which engages a screw-threaded bore in block 14 sothat appropriate angular movement of knob 31 causes the bolt 30 to drawthe block 14 down on to the surfaces 7 and 1d. The alignment adjustingmeans for block 14 is in the form of a control lever mechanism,comprising a lever 32 pivotally mounted on a lug 33 on the inside of thechannelsection arm 1. One end of lever 32 projects through a slot 34 inthe side wall of the bracket having the surface 10 and engages a groove35 in the side of block 14, and the other end `of the lever 32 is formedwith a recess into which projects a ring 36 ixedly mounted on ascrewthreaded spindle 37 which engages screw-threaded bores 1n bosses 38formed on the side walls of the channelsectlon arm 1 and is providedwith a knob 39.

The height-adjusting means for the diamond tools 15, 16 and 17 in theblocks 12, 13 and 14 comprises backingup screws, accessible throughholes 4) in the walls of the bracket having the surfaces S, 6 and 7, andengaged in screw-threaded bores in the blocks (see application SerialNo. 90,951 filed May 2, 1949, which issued as Patent No. 2,601,456, lune24, 1952).

The slide or tool-supporting member on which the mounting is carried isfirst adjusted so as to align the diamond tool 17 with the verticalcentre line B of the grmdlng wheel 41, which is rotated in the directionof the arrow A. The tool 17 is a roughing or worn finishing dlamond, andis used for first removing the bulk of the material from the edge of thegrinding wheel. It is set low, for example approximately 0.085, so thatafter it has been used there is sufiicient wheel stock left for thediamonds 16 and 15 to remove. After rough shaping of the grinding wheel,the diamond tool 16 is aligned with the vertical centre line B of wheel39 and is employed to semi-finish the contour of the grinding wheel. italso is set low, for example by 0.002, so as to leave suicient stock forthe nishing operation which is effected by aligning the tool 15 with thevertical centre lline B. Tool 1S, which is set to the correct height, isa true nishing diamond, and is used only for light finishing cuts,thereby considerably extending its accurate life. it becomes worn it canthen Ybe used as the semi-'finishing diamond and, after further wear, asthe roughing diamond. The desired setting of the tools may be effectedby, means of an indicator as described in application Serial No. 90,951(PatentNo. 2,601,456). n

The present invention may obviously be applied not only to mechanism fordressing grinding wheels but also to mechanism for profiling copper orother metal blanks, the diamond dressing-tools being replaced forexample by diamondtipped turning tools or carbide tipped tools.

Screws 22, 28 and 37 may be xedly, i. e., non-rotatably mounted, wheels21, 27 and 36 being rotatable on the respective screws and being formedas knurled nuts. This modification is shown in Figure 3.

I claim:

l. A tool mounting for dressing or profiling equipment, comprising aspindle provided with a bracket extending therefrom and adapted totraverse a predetermined profile of a grinding wheel or other ymember tobe dressed or profiled, said bracket being formed with a transverserecess adjacent its outer end, at least two tool carrier blocks intandem therein, locating Vsurfaces in said recess extending at an angleto each other to form corners, individual means in said bracket adaptedto adjust said carrier blocks laterally with respect to the spindleaxis, and individual clamping means in said bracket for said blocksadapted when tightened to clamp the blocks in any lateral adjustmentagainst said locating surfaces.

2. A tool mounting for a dressing device for abrasive wheels, comprisinga spindle having a bracket portion extending therefrom and providedadjacent its outer end with a recess, two locating surfaces in saidrecess extending at an angle to one another to form a corner, alaterally adjustable tool carrier block in said recess, a clamping screwmounted in said bracket portion and projecting between said surfacesfrom said corner so as to be capable of engaging said tool carrier blockto clamp said block in any lateral adjustment against said two surfaces,said portion also being formed to provide a well having at least twofurther surfaces in said recess eX- tending at an angle to one anotherto form a further corner, and a further clamping screw mounted in saidWhen ultimately bracket portion and projecting between said two furthersurfaces from said cornerV so as to be 'capable of engaging a furthertool carrier block to clamp said block against said two furthersurfaces.

3. A tool mounting for a dressing device for abrasive wheels, comprisinga spindle having a bracket portion extending therefrom and providedadjacent its outer end with a recess having two opposed spaced apartfirst side surfaces, two bottomV surfaces extending one from each ofsaid side surfaces toward the other side surface, two further opposedside surfaces extending one from each of said bottom surfaces, and afurther bottom surface interconnecting said further side surfaces toform a well between said first-mentioned bottom surfaces, a firstclamping screw mounted in said bracket portion and projecting betweenone of said rst side surfaces and the associated bottom surface from thecorner therebetween, a second clamping screw mounted in said bracketportion and projecting between the other of said first side surfaces andthe associated bottom surface from the corner therefrom, and a thirdclamping screw mounted in said bracket portion and projecting betweenone of said further side surfaces and said further bottoni surface fromthe corner therebetween.

4. A tool mounting according to claim 3, wherein said side surfaces aresubstantially at right angles to the associated bottom surfaces.

References Cited in the lile of this patent UNITED STATES PATENTS146,450 Haskins Jan. 13, 1874 180,409 Alvord Aug. 1, 1876 262,081 MetsAug. 1, 1882 627,099 Clugston June 20, 1899 1,073,964 Dabbs Sept. 23,1913 1,098,026 Domizi May 26, 1914 2,321,765 Mayer June 15, 19432,328,359 Ramsdell Aug. 31, 1943 2,377,822 Starn June 5,V 1945 2,402,650Maflia .Tune 25, 1946 2,404,148 Thompson July 16, 1946 FOREIGN PATENTS641,397 Great Britain Aug. 9, 1950

